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Патент USA US2107276

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Feb. s, 1938. '
Filed July 28, 1936
Wz'i/iam 7. Anderson ,
BY‘ M C”, 7%
Patented Feb. 8, 1938
William T. Anderson, llggertsville, N. Y., assignor
to E. I. du Pont de Nemours & Company, Wil
mington, DeL, a corporation of Delaware,
Application July 28, 1936, Serial No. 92,989
8 Claims.
This invention relates to machines for coat
ing ?exible sheet material and more particularly
to improved equipment for coating cloth with ya
(CI. 91-53)
angle of incidence formed by the material being
cellulose derivative composition. ‘
This invention may be considered an improve
ment or modi?cation of the apparatus described
in U. S. Patent No. 1,857,241 issued to William
H. Edmondson. In conventional coating ma
chines the fabric to be coated is unwound from
10 a roll and passed over suitable supports ‘to a
coating head where the composition is applied by
supplying an excess before a doctor knife.
composition is thereby spread over the sheet ma
terial in a more or less uniform layer.
16 vantages of these machines are that the compo
sition runs over the edges of the material being
coated and does not always coat the extreme
edges uniformly. ,\
This invention has as an object the provision
20 of apparatus which coats fabrics, whether deli
cate or heavy, uniformly even to the edges.
A further object is the provision of apparatus
_which simplifies the coating operation by the
elimination of a container located in front of
_ 2;, the doctor knife for the coating composition.v
A. still further object is the provision of an ap
paratus the use of which insures an exceptionally
uniform application of the coating composition
by means of specially designed knives.
A still further object is the provision of equip
ment in which the axis of the knife holder re
mains in a ?xed position for coating with the
various types of knives with respect to the rela
tion between its edge and the fabric to be coated.
coated and the doctor knife, 4 represents a screw
by means ‘of which the roll 3 may be raised or
lowered to change the angle of incidence, and 5
is a doctor knife mounted in the holder 6. The
angle which the doctor knife makes with the
cloth or other material being coated may also
be varied by means of the 'worm l, 8 represents
the composition which is being applied to the
sheet material, and 9 is a guide roll. The roll
it! is a rubber-covered, driven friction roll which
assists in drawing the fabric past the knife, II
is a heated drying chamber.
In the operation of the apparatus according
to the present invention, the fabric such as cloth
which is to be coated is unwound from the unwind
and passed over the tension rolls E3. The mate
rial then passes over roll 3 and under the edge
of the doctor knife 5 which may be ground to
any form depending on the amount of composi
tion desired to be deposited on the fabric.
There are also provided “ears”, not shown in
the drawing, mounted on each end of the knife
holder 5. The “ears" are approximately 4" to 6"
wide in the direction of the width of the mate
7 rial so as to prevent the jelly roll 8 from ap
proaching the edges of the web being coated
except in limited amounts as determined by un
dercutting the “ears” in a diagonal manner to
taper the jelly roll slowly to a point near the 30
selvage or edge of the web.
This machine is particularly adapted to coat
ing fabric with cellulose derivative compositions.
These compositions are usually prepared in a
form having the consistency of a jelly and may
Other objects will appear as the description of be eith
clear or pigmented. The amount of
the invention proceeds.
‘ 'composi ion deposited can be varied by increas
These objects are accomplished by means of an ing the tension of the fabric I. This may be
improved coating head placed before the stand
done by adjusting the tension on the unwind,
ard or other drying arrangement. This im
not shown in the drawing, or by changing the 40
' 40 proved. coating head is arranged to coat the position of the coating knife. The amount of
sheet material while it moves in a substan
composition deposited may also be varied by the
tially vertical plane before it enters the drying shape of the edge of the knife 5 which is in con
tact with the fabric to be coated. It is preferred
' In the drawing, Figure 1 represents an end ele
that the edge have the form of an arc of con 45
. 45 vation view of a coating head
stant radius even in cases where a comparatively
ranged according to the present invention. Fig
ures 2 and 3 are detailed views of the knife 5 in
' Figure 1. These ?gures represent a “full round”
or .“dull” blade and a modi?ed “dull” blade re
do spectively as‘ will be more ‘fully described later.
_ In Figure l, l represents the sheet material to
be coated, VIZ representsnip rolls _which guide
_ the material I around the tension rolls l3, 3 is
a smooth roll over which the material passes
, and which provides a means of adjusting the
sharp knife is used for special purposes. In gen
eral, it may be said that the smaller the radius
of curvature of the arm in contact with the cloth
the less composition will be applied’.
After passing under the knife blade, the mate
rial enters a heating chamber where the solvents
are volatilized and recovered. The heating cham
ber ll may be of any conventional type or that
disclosed in the copending application Serial No. 55
92,988 ?led July 28, 1936 in the name of Ander
require frequent grinding. This is‘a costly op
son &-Henry.
eration since great care is necessary in grinding
these knives in order that a uniform ?lm of com
The present invention provides many improve
ments. over the usual or conventional apparatus
for coating fabrics. For example, it is possible
to eliminate the so-called “dope” pan to collect
the coating composition in front of the coating
knife as is shown by Edmondson. in U.'S. Patent
1,857,241. It is also possible to use a knife hav
position will be applied. Moreover, the knives
having a. large contact surface area are not easily
dented or nicked as is the case with the sharp,
thin-lip variety.
As many apparently widely different embodi
ments of the invention may be made without de
10 ing an edge of such shape that the cloth follows , parting from its spirit and scope, it is to be un
exactly the entire edge thereby increasing the. derstood that the invention is not limited to the 10
contact area of the doctor blade and the sheet speci?c embodiments hereinbefore set out, except
material, giving a heavier and smoother. coat as de?ned in the appended claims.
than is possible‘ with former type knives. It is
I claim:
15 also possible to apply a thin coating on the fabric
1. Apparatus for coating fabrics which com
by using a knife the edge of which has a constant . prises a doctor knife, means for passing a fabric
radius but with a portion of the are cut away. in a substantially horizontal direction before con
When this has been done, the knife is .usually
tact with the knife, and‘means for moving the
designated as 1A round or 1/2 or “A round as the
case may be. When none of the edge has been
removed but a section through the blades shows
said fabric in a substantially vertical direction
after contact with the said knife.
2. Apparatus for applying cellulose derivative
coating compositions to fabric 'which comprises
an edge which resembles a semi-circle, it is called
a full round knife. By using such a knife, a
heavy smooth coat of cellulose derivative com
means for drawing the said fabric over an ad
justable guide roll and idler rolls‘ and a coating
knife disposed between two of the rolls such that
the fabric approaching the knife passes in substantially a horizontal plane and the fabric leav
ing the knife passes in substantially a vertical
25 position may be applied which heretofore could
only be accomplished by more than one pass
through the coating head.
The knife bar, if preferred, may be constructed
by coring out a portion and ?tting it to hot and
30 cold water connections solthat the optimum tem
perature of the jelly at the doctor blade may be
The apparatus herein disclosed presents the
which comprises means for passing the said fabric
over an adjustable guide roll, means for passing
the fabric in substantially a horizontal plane to
a doctor knife and means for passing the fabric
advantage that the coating composition con
35 tainer may be eliminated which in turn saves
time in cleaning and changing from one color
after it'leaves the doctor knife in substantially
a vertical plane over guide and friction rolls to
or type of composition to another with less loss
of running time and coating compositions.
a heating chamber.
Another advantage is that by use of the driven .
friction roll immediately following the coating
knife there is less tension on the fabric being
coated as it travels onward throughtthe drying
equipment. This is advantageous because it re
duces the tension on the warp threads, while the
fabric is passing through the drier, thereby re
sulting in little or no pull down in width of the
cloth.v As a result it is possible to use cloth of
a narrower ‘width than required by machines
which do not have such a driven friction roll.
The so-called "rib” effect, which is an imprintof
the goods showing through the coating, is practi
cally eliminated.
A further advantage is that'the axis of the ro
tatable knife holder remains in a fixed position
55, and may be used for the various types of knives
used in coating.
The rotatable knife holder af-
fords access to knives for cleaning and changing.
' The uniform arc of contact with the knife edge
3. ‘Apparatus for ‘applying a cellulose deriva 30
tive coating composition to fabric sheet material'
4. Apparatus of claim 1 in which the edge of the
knife only in contact with the fabric has a con 40
stant radius.
5. Apparatus of claim 2 in which the edge of
the knife only in contact with the fabric has a
constant radius.
6. Apparatus of claim 3 in which the edge of 45
the knife only in contact with the. fabric has a
7. Apparatus for applying a cellulose derivative
coating composition to a fabric sheet which com
prises means for passing the said fabric over an 0
adjustable guide roll, means for passing the fab
ric in. a substantially horizontal plane to a coat
ing knife and means for passing the fabric after
it leaves the said knife in substantially a vertical
plane and a driven friction roll to assist in draw 55
- ing the fabric under the knife.
8. The combination of means for passing a
fabric in a horizontal direction and in a substan
tially vertical’direction and a doctor knife having
a rounded edge which is a portion of the‘arc-of 60
permits the coating of very thin fabrics which
60. could be coated only with great ‘di?iculty in the
conventionalrt'ype machines. A still further ad
a circle, said cloth bearing against the said round- ‘
vantage resides in the fact that knives having a 7 ed edge of the knife at the point in-which the di- uniform radius have a much longer life and in rection of the cloth changes from horizontal to
that the knife‘is worn away uniformly without vertical.
65 change in the shape of the edge and does not
Patent vNo , 2,107 , 276.,
February 8, 1938.
T .
It is hereby certified that error appears in the printed specification '
of the above numbered patent requiring correction as follows: Page 1, second
column, line LL9, for ‘the word "arm" read arc; and that the s aid Letters
Patent should be read with this correctiontherein that the same may conform
to the record of the
case in the Patent Office .
Signed and sealed this 12th day’ of April, Ao D. 1958.
Henry Van Arsdale ,
Acting‘ Commissioner of Patents.‘
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